/*!	 valuenode_subtract.cpp
**	 Implementation of the "Subtract" valuenode conversion.
**
**	Copyright (c) 2002-2005 Robert B. Quattlebaum Jr., Adrian Bentley
**	Copyright (c) 2007, 2008 Chris Moore
**  Copyright (c) 2011 Carlos López
**
**	This package is free software; you can redistribute it and/or
**	modify it under the terms of the GNU General Public License as
**	published by the Free Software Foundation; either version 2 of
**	the License, or (at your option) any later version.
**
**	This package is distributed in the hope that it will be useful,
**	but WITHOUT ANY WARRANTY; without even the implied warranty of
**	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
**	General Public License for more details.
**
*/

#ifdef USING_PCH
#	include "pch.h"
#else
#ifdef HAVE_CONFIG_H
#	include <config.h>
#endif

#include <synfig/general.h>
#include <synfig/localization.h>
#include <synfig/valuenode_registry.h>
#include "valuenode_subtract.h"
#include "valuenode_const.h"
#include <stdexcept>
#include <synfig/color.h>
#include <synfig/gradient.h>
#include <synfig/vector.h>
#include <synfig/angle.h>
#include <synfig/real.h>
#include <ETL/misc>

#endif

using namespace std;
using namespace etl;
using namespace synfig;

REGISTER_VALUENODE(ValueNode_Subtract, RELEASE_VERSION_0_61_06, "subtract", "Subtract")

synfig::ValueNode_Subtract::ValueNode_Subtract(const ValueBase &value):
    LinkableValueNode(value.get_type())
{
    Vocab ret(get_children_vocab());
    set_children_vocab(ret);
    set_link("scalar", ValueNode_Const::create(Real(1.0)));
    Type &type(value.get_type());

    if (type == type_angle) {
        set_link("lhs", ValueNode_Const::create(value.get(Angle())));
        set_link("rhs", ValueNode_Const::create(Angle::deg(0)));
    } else if (type == type_color) {
        set_link("lhs", ValueNode_Const::create(value.get(Color())));
        set_link("rhs", ValueNode_Const::create(Color(0, 0, 0, 0)));
    } else if (type == type_gradient) {
        set_link("lhs", ValueNode_Const::create(value.get(Gradient())));
        set_link("rhs", ValueNode_Const::create(Gradient()));
    } else if (type == type_integer) {
        set_link("lhs", ValueNode_Const::create(value.get(int())));
        set_link("rhs", ValueNode_Const::create(int(0)));
    } else if (type == type_real) {
        set_link("lhs", ValueNode_Const::create(value.get(Real())));
        set_link("rhs", ValueNode_Const::create(Real(0)));
    } else if (type == type_time) {
        set_link("lhs", ValueNode_Const::create(value.get(Time())));
        set_link("rhs", ValueNode_Const::create(Time(0)));
    } else if (type == type_vector) {
        set_link("lhs", ValueNode_Const::create(value.get(Vector())));
        set_link("rhs", ValueNode_Const::create(Vector(0, 0)));
    } else {
        assert(0);
        throw runtime_error(get_local_name() + _(":Bad type ") + type.description.local_name);
    }

    assert(ref_a->get_type() == type);
    assert(ref_b->get_type() == type);
    assert(get_type() == type);
}

LinkableValueNode*
ValueNode_Subtract::create_new()const
{
    return new ValueNode_Subtract(get_type());
}

ValueNode_Subtract*
ValueNode_Subtract::create(const ValueBase& value)
{
    return new ValueNode_Subtract(value);
}

synfig::ValueNode_Subtract::~ValueNode_Subtract()
{
    unlink_all();
}

synfig::ValueBase
synfig::ValueNode_Subtract::operator()(Time t)const
{
    if (getenv("SYNFIG_DEBUG_VALUENODE_OPERATORS")) {
        printf("%s:%d operator()\n", __FILE__, __LINE__);
    }

    if (!ref_a || !ref_b) {
        throw runtime_error(strprintf("ValueNode_Subtract: %s", _("One or both of my parameters aren't set!")));
    }

    Type &type(get_type());

    if (type == type_angle) {
        return ((*ref_a)(t).get(Angle()) - (*ref_b)(t).get(Angle())) * (*scalar)(t).get(Real());
    }

    if (type == type_color) {
        return ((*ref_a)(t).get(Color()) - (*ref_b)(t).get(Color())) * (*scalar)(t).get(Real());
    }

    if (type == type_gradient) {
        return ((*ref_a)(t).get(Gradient()) - (*ref_b)(t).get(Gradient())) * (*scalar)(t).get(Real());
    }

    if (type == type_integer) {
        return round_to_int(((*ref_a)(t).get(int()) - (*ref_b)(t).get(int())) * (*scalar)(t).get(Real()));
    }

    if (type == type_real) {
        return ((*ref_a)(t).get(Vector::value_type()) - (*ref_b)(t).get(Vector::value_type())) * (*scalar)(t).get(Real());
    }

    if (type == type_time) {
        return ((*ref_a)(t).get(Time()) - (*ref_b)(t).get(Time())) * (*scalar)(t).get(Real());
    }

    if (type == type_vector) {
        return ((*ref_a)(t).get(Vector()) - (*ref_b)(t).get(Vector())) * (*scalar)(t).get(Real());
    }

    assert(0);
    return ValueBase();
}

bool
ValueNode_Subtract::set_link_vfunc(int i, ValueNode::Handle value)
{
    assert(i >= 0 && i < link_count());

    switch (i) {
    case 0:
        CHECK_TYPE_AND_SET_VALUE(ref_a,  get_type());

    case 1:
        CHECK_TYPE_AND_SET_VALUE(ref_b,  get_type());

    case 2:
        CHECK_TYPE_AND_SET_VALUE(scalar, type_real);
    }

    return false;
}

ValueNode::LooseHandle
ValueNode_Subtract::get_link_vfunc(int i)const
{
    assert(i >= 0 && i < link_count());

    switch (i) {
    case 0:
        return ref_a;

    case 1:
        return ref_b;

    case 2:
        return scalar;

    default:
        return 0;
    }
}

bool
ValueNode_Subtract::check_type(Type &type)
{
    return type == type_angle
           || type == type_color
           || type == type_gradient
           || type == type_integer
           || type == type_real
           || type == type_time
           || type == type_vector;
}

LinkableValueNode::Vocab
ValueNode_Subtract::get_children_vocab_vfunc()const
{
    if (children_vocab.size()) {
        return children_vocab;
    }

    LinkableValueNode::Vocab ret;

    ret.push_back(ParamDesc(ValueBase(), "lhs")
                  .set_local_name(_("LHS"))
                  .set_description(_("Left Hand Side of the subtraction"))
                 );

    ret.push_back(ParamDesc(ValueBase(), "rhs")
                  .set_local_name(_("RHS"))
                  .set_description(_("Right Hand Side of the subtraction"))
                 );

    ret.push_back(ParamDesc(ValueBase(), "scalar")
                  .set_local_name(_("Scalar"))
                  .set_description(_("Value that multiplies the subtraction"))
                 );

    return ret;
}